Control valve
US5376029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1993 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Mar 25, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87185
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control valve for a pressurized fluid-operated system, such as a marine power steering system, includes a housing having an inlet and at least one outlet, with one or more work ports located therebetween. Pressurized fluid is supplied to the inlet, and a spool member is mounted within the housing for controlling the supply of pressurized fluid to a work-performing system, such as the extendible and retractable rod of a hydraulic cylinder assembly. The spool member includes structure for blocking the one or more work ports when the spool member is in its neutral position, when it is desired not to operate the system. This prevents the cylinder from being exposed to reservoir fluid when the spool member is in its neutral position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.